All challenges

Draw a square grid map whose color adjacencies exactly realize a country graph while minimizing K/N.

Rotate railway tiles to form two large loop lines.

Reconstruct a toroidal character matrix that contains many observed strings.

Find a high-value path on a tiled 50 by 50 board without revisiting a tile.

Move soil with a truck to level a grid while minimizing loading, travel, and unloading cost.

Compute the requested smallest snake coverage values.

Slide tiles so the resulting line drawing contains a large tree.

Visit ordered targets on a skating rink using moves, slides, and block alterations.

Choose a route string that still reaches the goal with high probability after omissions.

Add grid points by drawing valid axis-aligned or diagonal rectangles.

Place many grid points while avoiding the four corners of every axis-aligned rectangle.

Emit a simple valid move script for the pet shelter simulation instance.